“A central part of Amazon’s online computing foundation is growing up. “Amazon EC2 is now in full production,” Barr said in a blog post Thursday. And as promised, EC2 now offers Windows in a beta test, joining Sun Microsystems’ OpenSolaris and Solaris Express Community Edition. Along with those moves, EC2 now comes with a service level agreement, a formal commitment that the service will be available at least 99.95 percent of the time.”